Stock-feeding mechanism for screw-machines.



Patenten my 113,. 1899.

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No. 629,16l. Patented July 18, :89s. gl-MRTNBSS. f STUCK FEEDIM? MECHANISI FDR SCREW. MACHINES.

' (Application filed Apr. 27, 1899.) (un maps.) 'a sham-sheet 3.

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i i NITnD" "STATES :PA-TENT FFICE JAMES HARTNESS, OF SPRINGFIELD, VERMONT.

sTocK-FEl-:DINGMEoHANlsM Foie SCREW-MACHINES.

PEGIFICAIION' forming part of Letters IE'atent No. 629,161, dated VJ'iily 18, 1899.

Y Application filed April 27, 1899. Serial No. 714,673. (No model.)

,To @L whom it may concern,.- Y

Beit known that I, JAMESHARTNESS, of Springeld,inthecountyofWindsorandState of Vermont, have invented certain new andl useful Improvements in' Stock-Feeding Mechanism for Screw-ll/Iachines, of which the following is a specification.

This invention has relation to means'for feeding rotating stocksuch as bars, rods, or wires of metal-through the holding-chucks of screw-machines, and particularly to those feeding devices in which the feed-,wheels ro-I tate about their own axes and also revolve -about the axis of the stock.

Heretofore in such machines as J ust referred to the feeding-wheels have been'in continu* ous operative engagement with the stock and were caused to rotate intermittently whendesired by suitably-contrclledv mechanism.' It

was necessary therefore to engage 'and disengage the members of the gearing, which, as is well known, is Vfrequently an undesirable operationon account of the diculty in bringing said gear members properly into mesh.

lThe present invention contemplates the employment of feed-wheels which are in constant rotation (while theistock is being rotated) and mechanism for bringing them into operative engagementwith the stock when it is necessary to feed the latter, said wheels being at all other times'in an inoperative position. By this' construction the' gear members for rotating the feed-wheels may remainconstantly enmeshed, andl thestock may befed through the chuck without retarding or other? wise affecting its rotation.

Reference is to be had to the accompanying drawings, and to the letters marked thereon, forming a part of this specication, the same letters designating the same parts or features,:

as the case maybe, whereverthey occur.

Of the drawings, Figure l represents in side elevation a portion of the head-stock of a screw-machine and my improved mechanism for feeding the stock through the chuck-spindle. Fig, 2 represents a'longitudinal section through'the same. Fig. 3 represents a transverse section' onY the line 3A 3 of Fig. 2. Fig 4 represents a transverse section on the line 4 4 of Fig. 1. Figs. 5 to 7, inclusive, represent the invention in4 detail.

Of the drawings, a represents'a head or 'holder having a huh a', which is, affixed th the.

spindle h of a lathe or screw-machine, as in my prior patent, No. 425,377, dated April 8, 1890. 'the other end of the spindle, which is tubular, to admit thepassage therethrough of the stock'.` By stock I mean to include the rod, bar, orwire by which screws or other like articles are made by the mechanism with whichl the machine having myimproved feed- Chuck mechanism may be secured to ing devices is provided. The spindle isv suitably journaled in a bushing b', `carried by the jhead-stockbofwhich only a portion is shown.

The head a has a face-plate a2 with an annular iiange d3 to receive the guiding-screws a4, .which are adjustable radially therein and which may be secured after adjustment'by set-screws a5,passed into the end ofthe flange, as shcwn.`

The feedingrolls are indicated at c c, respeetively., and are rigidly secu red upon shafts 'd d, which are journaled in blocks or carriers e, arranged to slide in guides a6, formed in the inner face of the plate d2. These blocks or carriers are simultaneously movable in opposite directions radially ofthe head to move the feeding devices into and out of operative engagement with the stock, the mechanism for aiording such movement being preferably connected to the devices by means of which the chuck is opened and closed. On the ends of theshafts d which project out from thecarriers are rigidlysecured'worm- 4wheels el' d, which intermesh with worms f j, rigidly secured to shafts g g,journaled in bearings in the head a, as' clearly shown in Fig. 3, each shaft g being provided 'with two worms, between which is a worm-Wheel h, which projects through an aperture in the head into operative engagement with a stationary scroll or worm i. J l p part consists of a ring supported byfa bracket i', rigidlyattached to the head-stock, and it encircles the hub a' of thehead. Onits front 'face the ring is provided with teeth, which are cut tangentially, each tooth being a tangent of a circle of less diameter thanthe interior of the ring, as shown in Fig, 4.

The worms on each shaft gare threaded right and left hand, respectively, and they are all so arranged that when-the head is rotated the engagement of the worm-Wheelsh The last-mentioned IOO rotation of the head is sufiicient under ordi-vv nary circumstances to throw the carriers e e upward and out of operative engagement, so that the feed-rolls will be out of operative engagement with the stock, and hence to move said carriers inward radially of the head I provide spring-leversj 7rwhich are fulcrumed at j and Zt, respectively, on ears projecting outward from the head. Said springlevers overlap at their inner ends, as at ,7'2 k2, and 'their outer ends take overthe heads of screws Z Z, threaded into the carriers c e, said levers bearing against shoulders Z Z', formed on said screws. The levers are arranged outside of the head e, andthe screws project through the periphery thereof, as indicated in Fig. 2.

A rocker fm is fulcrumed upon a stud m on the rear face of the head and is provided with a central cam projection m2 to engage the inner end of the leverj to operate it and the lever 7s simultaneously to force the carriers c e inward radially of the head. Said rocker consists of a lever with cam portions m3 m at its ends, said last-mentioned cam m4 being offset, as best shown in Fig. l. Zhen said rocker is in the position shown in Fig. 3, the cam projection m2 forces the inner ends of the levers j Zt outward, and thereby move the carriers e e inward to operatively engage the feed-rolls c c with the stop, said carriers being moved inward yieldingly by the outer spring ends of said levers j k; but when the rocker is moved into the position shown in Fig. 5 the carriers are permitted to separate and move outward, this being accomplished by centrifugal action as the head rotates, although, if desired, I may use a spring for accomplishing this purpose.

To swing the rocker fm about its fulcrum into and out of operative position, I employ a roller fn, journaled upon theend of a slide n', movable through a bracket n2, formed on or attached to the head-stock. By moving the slide '1t' the roller 11 may be moved into the path of the cam m3 or the cam nrl of the rocker m to tilt it in one direction or the other, as the case may be. Said slide n is pivotally connected to a lever n3, fulcrumed-at '/t on the l1ead-stock and connected by a connecting-rod`n5 to the chuck-operating devices, (not shown,) the construction being such that when the chuck is opened the slide 'n' is moved to cause the spring-levers j 7.a to move the carriers and thrust the feed-rolls into operative engagement with the stock.

Normally the parts are in the position shown in dotted li'nes in Fig. l; but when the chuck is opened the slide is moved to. the position shown in full lines in said last-mentioned iigure, so that the cam m4 strikes against the roll and swings the rocker about its fulcrum or stud m', whereupon the cam m2 engages the 'endg'2 of the leverj and forces the inner ends of the two said levers outward to move the feed-rolls into operative position; but when the chuck is closed the roller n is moved back to the position shown in dotted lines in said figure and engages the end m3, and the rocker dise-ngages the cam m2 from the levers j 7o and permits the carriers e c to separate.

It is evident that my invention is not lim ited to the devices which I have shown and described for rotating the feed-rolls or for moving them into and out of engagement with the stock, for any other mechanisms which will accomplish the functions specified are included thereby.

Having thus explained the nature of my invention and described a way of constructing and using the same, though without attempting to set forth all of the forms in which it may be made or all-of the modes of its use, what I claim, and desire to secure by Letters Patent, is-

1. The combination of a rotatable head, continuously-rotating feed-rolls carried by said head, and .means for moving said rolls radially of said head, or releasing them from operative engagement with the stock while the'head is rotating.

2. The combination of a rotatable head, feed-rolls carried by said head and normally disengaged from the stock, means for rotating said rolls, and means for moving said rolls into operative engagement with the stock during the rotation of the head.

3. The combination of a rotatable head, feed-rolls carried by said head and normally disengaged from the stock, means forrotatin g said rolls continuously during the rotation of said head, and means for moving said rolls into engagement with the stock.

el. The combination of Aa rotatable head adapted to permit the passage of stock centrally therethrough, feed-rolls carried by the head normally out of operative engagement with said stock and adapted to simultaneously bear upon the stock, mechanism for imparting a rotation to said rolls so long as the head rotates, and mechanism for moving said rolls into operative engagement with the stock comprising carriers for the rolls, and means for moving the carriers.

5. The combination of a rotatable head, rolls carried by the head for feeding stock through said head, means for rotating said rolls, and mechanism for moving said 'rolls into operative engagement with said stock said mechanism comprising carriers for the rolls, and a rocker controlling said carriers.

6. The combination of a rotatable head, rolls carried by the head for feeding stock through said head, means for rotating said IOO IIO

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eeaiei e 1'olls, and mechanism for moving said rolls into operative'engagement with said stock, said mechanism comprising carriers for the rolls,pivoted levers connected to said carriers,

and means for swinging said levers simultaneously about theiil fulcrums.

S. The combination of a rotatable head, rolls carried by the head for feeding stock through said head, means for rotating said iolls, and mechanism for moving said rolls into operative engagement with said stock,

said mechanism'compiising carriers for the rolls, a rocker foi1 actuating said carriers and having au offset end, and means for tilting said rocker. Y

. 9. The combinati@ of a rotatable head, rolls carried by the head adapted to feed the stock therethrough, means for continuously Vrotating the roils, means for adjusting therolls radially of the head, and mechanism for moving said rolls into or releasing them from engagement with the stock. I

In testimony whereof I have affixed my signature in presence kof two Witnesses.

JAMES HARTNESS.

Wi t-nesses F. P. L'ovnJoY, W. LE ROY BRYANT. 

